What is the problem
First layer print all of a sudden increases the Z by 4mm for 1/2 of the print
What did you already try to solve it?
bed leveled
Have you tried running in safe mode?
no
Did running in safe mode solve the problem?
dont think its a safe mode solution
Systeminfo Bundle
upgraded to 1.9
WRITE HERE
OctoPrint: 1.9.0 , Version 1.0.0, running on Raspberry Pi 4 Model B Rev 1.2, firefox win 10